Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  9fbdd32986358ee9143960e1743c5d4bd5dfd57f

Make undo work for changes to MWExtensionNodes

If you changed the contents of an alien tag extension, then tried to
use undo, the change wouldn't be undone, but the undo state would
toggle.

This was because we only kept one copy of the data-mw object for these
nodes and modified that one copy. Instead, create a new copy every time
we modify it, so we can actually go back to previous states.

Change-Id: Ib4d5d460a6fdda9c3b0968f269585d620b47fdd8